[Mister Moose]

Take the battery out, charge it, then take it to a garage and get the battery load tested. I'm thinking you have either a bad battery from the get go, or a drain on the battery once installed.

So step one, determine the real health of the battery.

Step two, with the battery out take an ohm meter and measure the resistance between the negative (hot) cable and ground. Ignition and lights off. It should be infinite. If not, find the reason why.

Step Three, remove the accessory lead from the starter, or if you have a fuse there, remove it. Take a known fully charged healthy battery and install it in the it in the car. Press the starter. If it doesn't crank you have either a starter problem or a starter switch problem or a cable problem.

You just have to keep isolating and testing. Good luck.